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PT UNIT USER MANUAL
APRIL 2023 www.eaton.com.cn
Screws
Guide grooves
10.2 Replacing the Trip Unit
The PT unit is designed as a field replaceable unit.
•
Remove the circuit breaker front cover.
•
Remove the trip unit harness from the top of the trip
unit.
•
Loosen the top and bottom screws using a screwdriver.
Note that the bottom screw is located on the left side of
the USB port and is covered by a door.
•
Pull the trip unit’s control module outward for removal.
Figure 16. Location of the Top and Bottom Trip Unit
Screws
To install a new trip unit:
•
First, connect the wiring harness at the top of the trip
unit’s control module (such harness is not available for
certain trip unit styles).
•
Align the trip unit’s control module with the guide
grooves of the frame module and press it down.
•
Connect the control module tightly to the frame module
of the trip unit, until the trip unit seats firmly in the
housing.
•
Secure the trip unit with the mounting screws using a
screwdriver, with the maximum screw torque of 1.0N· M
(8.9 lbf/in.).
•
Replace the circuit breaker front cover.
10. Maintenance of the PT Trip Unit
